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                <h2 id="Stream流"><a href="#Stream流" class="headerlink" title="Stream流"></a>Stream流</h2><p>&#x2F;*<br>    使用传统的方式遍历集合，对集合中的数据进行过滤</p>
<p> *&#x2F;</p>
 <span id="more"></span>
<p>public class Demo01List {<br>    public static void main(String[] args) {<br>        &#x2F;&#x2F;创建一个List集合存储姓名<br>        List<String> list &#x3D; new ArrayList&lt;&gt;();<br>        list.add(“张无忌”);<br>        list.add(“周芷若”);<br>        list.add(“赵敏”);<br>        list.add(“张强”);<br>        list.add(“张三丰”);</p>
<pre><code>    //对list集合中的元素进行过滤,只要以张开头的元素,存储到一个新的集合中
    List&lt;String&gt; listA = new ArrayList&lt;&gt;();
    for (String s : list) &#123;
        if(s.startsWith(&quot;张&quot;))&#123;
            listA.add(s);
        &#125;
    &#125;

    //对ListA过滤,只要姓名长度为三
    List&lt;String&gt; listB = new ArrayList&lt;&gt;();
    for (String s : listA) &#123;
        if(s.length()==3)&#123;
            listB.add(s);
        &#125;
    &#125;

    for (String s : listB) &#123;
        System.out.println(s);
    &#125;
&#125;
</code></pre>
<h2 id=""><a href="#" class="headerlink" title="}"></a>}</h2><p>&#x2F;*<br>    使用Stream流的方式,遍历集合,对集合中的数据进行过滤<br>    关注的是做什么而不是怎么做<br> *&#x2F;<br>public class Demo02Stream {<br>    public static void main(String[] args) {<br>        List<String> list &#x3D; new ArrayList&lt;&gt;();<br>        list.add(“张无忌”);<br>        list.add(“周芷若”);<br>        list.add(“赵敏”);<br>        list.add(“张强”);<br>        list.add(“张三丰”);</p>
<pre><code>    list.stream()
        .filter(name-&gt;name.startsWith(&quot;张&quot;))
        .filter(name-&gt;name.length()==3)
        .forEach(name-&gt; System.out.println(name));
    
&#125;
</code></pre>
<p>}</p>
<p>整体来看，流式思想类似于工厂车间的生产流水线<br>Stream流是一个来自数据源的元素队列<br>元素是特定类型的对象，形成一个队列<br>数据源：流的来源，可以是集合，数组等<br>pipelining：之间操作都会返回流对象本身。这样多个操作可以串联成一个管道，对操作进行优化<br>内部迭代：流可以直接调用遍历方法</p>
<p>1.3 获取流<br>所以Collection集合都可以通过stream默认方法获取流<br>Stream接口的静态方法of可以获取数组对应的流<br>public class Demo02GetStream {<br>    public static void main(String[] args) {<br>        &#x2F;&#x2F;把集合转换为Stream流<br>        List<String> list &#x3D; new ArrayList&lt;&gt;();<br>        Stream<String> stream1 &#x3D; list.stream();</p>
<pre><code>    Set&lt;String&gt; set = new HashSet&lt;&gt;();
    Stream&lt;String&gt; stream2 = set.stream();
    
    Map&lt;String,String&gt; map = new HashMap&lt;&gt;();
    //获取键,存储到一个Set集合中
    Set&lt;String&gt; keySet = map.keySet();
    Stream&lt;String&gt; stream3 = keySet.stream();
    //获取值,存储到一个Collection集合
    Collection&lt;String&gt; values = map.values();
    Stream&lt;String&gt; stream4 = values.stream();
    //获取键值对,entrySet
    Set&lt;Map.Entry&lt;String,String&gt;&gt; entries = map.entrySet();
    Stream&lt;Map.Entry&lt;String,String&gt;&gt; stream5 = entries.stream();
    
    //把数组转换为Stream流
    Stream&lt;Integer&gt; stream6 = Stream.of(1,2,3,4,5);
    //可变参数可以传递数组
    Integer[] arr = &#123;1,2,3,4,5&#125;;
    Stream&lt;Integer&gt; stream7 = Stream.of(arr);
&#125;
</code></pre>
<h2 id="-1"><a href="#-1" class="headerlink" title="}"></a>}</h2><p>1.4 常用方法<br>延迟方法：返回值类型仍然是Stream接口自身类型的方法，因此支持链式调用。除了终结方法，其余方法均为延迟方法<br>终结方法：返回值类型不再是Stream接口自身类型的方法，不再支持链式调用。常用有count，forEach</p>
<p>逐一处理：forEach<br>&#x2F;*<br>    forEach方法用来遍历流中的数据<br>    是一个终结方法,遍历之后就不能再调用Stream流中的其他方法<br>    该方法接收一个Consumer接口函数,会将每一个流元素交给该函数进行处理,Consumer接口可传递Lambda表达式</p>
<h2 id="x2F-public-class-Demo02Stream-forEach-public-static-void-main-String-args-x2F-x2F-获取一个Stream流-Stream-stream-x3D-Stream-of-“张三”-“李四”-“王五”-“赵六”-“田七”-x2F-x2F-x2F-x2F-使用forEach遍历-x2F-x2F-stream-forEach-String-name-gt-x2F-x2F-System-out-println-name-x2F-x2F-x2F-x2F-化简-stream-forEach-name-gt-System-out-println-name"><a href="#x2F-public-class-Demo02Stream-forEach-public-static-void-main-String-args-x2F-x2F-获取一个Stream流-Stream-stream-x3D-Stream-of-“张三”-“李四”-“王五”-“赵六”-“田七”-x2F-x2F-x2F-x2F-使用forEach遍历-x2F-x2F-stream-forEach-String-name-gt-x2F-x2F-System-out-println-name-x2F-x2F-x2F-x2F-化简-stream-forEach-name-gt-System-out-println-name" class="headerlink" title=" *&#x2F;public class Demo02Stream_forEach {    public static void main(String[] args) {        &#x2F;&#x2F;获取一个Stream流        Stream stream &#x3D; Stream.of(“张三”, “李四”, “王五”, “赵六”, “田七”);&#x2F;&#x2F;		&#x2F;&#x2F;使用forEach遍历&#x2F;&#x2F;		stream.forEach((String name) -&gt; {&#x2F;&#x2F;			System.out.println(name);&#x2F;&#x2F;		});        &#x2F;&#x2F;化简        stream.forEach(name -&gt;System.out.println(name));    }}"></a> *&#x2F;<br>public class Demo02Stream_forEach {<br>    public static void main(String[] args) {<br>        &#x2F;&#x2F;获取一个Stream流<br>        Stream<String> stream &#x3D; Stream.of(“张三”, “李四”, “王五”, “赵六”, “田七”);<br>&#x2F;&#x2F;		&#x2F;&#x2F;使用forEach遍历<br>&#x2F;&#x2F;		stream.forEach((String name) -&gt; {<br>&#x2F;&#x2F;			System.out.println(name);<br>&#x2F;&#x2F;		});<br>        &#x2F;&#x2F;化简<br>        stream.forEach(name -&gt;System.out.println(name));<br>    }<br>}</h2><p>过滤：filter<br>&#x2F;*<br>    过滤:filter,接收Predicate接口<br> *&#x2F;<br>public class Demo03Stream_filter {<br>    public static void main(String[] args) {<br>        Stream<String> stream &#x3D; Stream.of(“张三丰”,”张无忌”,”西门吹雪”,”周芷若”,”赵敏”);<br>        &#x2F;&#x2F;对Stream流中的元素进行过滤,只要姓张的<br>&#x2F;&#x2F;		Stream<String> stream2 &#x3D; stream.filter((String name)-&gt;{<br>&#x2F;&#x2F;			return name.startsWith(“张”);<br>&#x2F;&#x2F;		});<br>        &#x2F;&#x2F;简化<br>&#x2F;&#x2F;		Stream<String> stream2 &#x3D; stream.filter(name-&gt; name.startsWith(“张”));<br>&#x2F;&#x2F;		stream2.forEach(name-&gt; System.out.println(name));<br>        &#x2F;&#x2F;链式<br>        stream.filter(name-&gt; name.startsWith(“张”))<br>            .forEach(name-&gt; System.out.println(name));<br>    }<br>}</p>
<hr>
<p>Stream流属于管道流，只能被消费(使用)一次<br>第一个Stream流调用完毕后,数据就会流到下一个Stream上,此时第一个流已经使用完毕,就会关闭<br>所以第一个流不能再调用方法了</p>
<h2 id="映射-map如果需要将流中的元素映射到另一个流中，可以使用map方法需要Function函数式接口public-class-Demo04Stream-map-public-static-void-main-String-args-Stream-stream-x3D-Stream-of-“1”-”2”-”3”-”4”-x2F-x2F-使用map方法-把字符串类型的整数-转换为Integer类型的整数-Stream-stream2-x3D-stream-map-String-s-gt-return-Integer-parseInt-s-x2F-x2F-遍历Stream2流-stream2-forEach-i-gt-System-out-println-i"><a href="#映射-map如果需要将流中的元素映射到另一个流中，可以使用map方法需要Function函数式接口public-class-Demo04Stream-map-public-static-void-main-String-args-Stream-stream-x3D-Stream-of-“1”-”2”-”3”-”4”-x2F-x2F-使用map方法-把字符串类型的整数-转换为Integer类型的整数-Stream-stream2-x3D-stream-map-String-s-gt-return-Integer-parseInt-s-x2F-x2F-遍历Stream2流-stream2-forEach-i-gt-System-out-println-i" class="headerlink" title="映射:map如果需要将流中的元素映射到另一个流中，可以使用map方法需要Function函数式接口public class Demo04Stream_map {    public static void main(String[] args) {        Stream stream &#x3D; Stream.of(“1”,”2”,”3”,”4”);        &#x2F;&#x2F;使用map方法,把字符串类型的整数,转换为Integer类型的整数        Stream stream2 &#x3D; stream.map((String s)-&gt;{            return Integer.parseInt(s);        });        &#x2F;&#x2F;遍历Stream2流        stream2.forEach(i-&gt; System.out.println(i));    }}"></a>映射:map<br>如果需要将流中的元素映射到另一个流中，可以使用map方法<br>需要Function函数式接口<br>public class Demo04Stream_map {<br>    public static void main(String[] args) {<br>        Stream<String> stream &#x3D; Stream.of(“1”,”2”,”3”,”4”);<br>        &#x2F;&#x2F;使用map方法,把字符串类型的整数,转换为Integer类型的整数<br>        Stream<Integer> stream2 &#x3D; stream.map((String s)-&gt;{<br>            return Integer.parseInt(s);<br>        });<br>        &#x2F;&#x2F;遍历Stream2流<br>        stream2.forEach(i-&gt; System.out.println(i));<br>    }<br>}</h2><h2 id="统计个数：count计数流中的元素个数-x2F-long-count-count是一个终结方法-返回值是一个long类型的整数-x2F-public-class-Demo05Stream-count-public-static-void-main-String-args-ArrayList-list-x3D-new-ArrayList-lt-gt-list-add-1-list-add-2-list-add-3-list-add-4-list-add-5-list-add-6-list-add-7-Stream-stream-x3D-list-stream-long-count-x3D-stream-count-System-out-println-count"><a href="#统计个数：count计数流中的元素个数-x2F-long-count-count是一个终结方法-返回值是一个long类型的整数-x2F-public-class-Demo05Stream-count-public-static-void-main-String-args-ArrayList-list-x3D-new-ArrayList-lt-gt-list-add-1-list-add-2-list-add-3-list-add-4-list-add-5-list-add-6-list-add-7-Stream-stream-x3D-list-stream-long-count-x3D-stream-count-System-out-println-count" class="headerlink" title="统计个数：count计数流中的元素个数&#x2F;*    long count();    count是一个终结方法,返回值是一个long类型的整数 *&#x2F;public class Demo05Stream_count {    public static void main(String[] args) {        ArrayList list &#x3D; new ArrayList&lt;&gt;();        list.add(1);        list.add(2);        list.add(3);        list.add(4);        list.add(5);        list.add(6);        list.add(7);        Stream stream &#x3D; list.stream();        long count &#x3D; stream.count();        System.out.println(count);    }}"></a>统计个数：count<br>计数流中的元素个数<br>&#x2F;*<br>    long count();<br>    count是一个终结方法,返回值是一个long类型的整数<br> *&#x2F;<br>public class Demo05Stream_count {<br>    public static void main(String[] args) {<br>        ArrayList<Integer> list &#x3D; new ArrayList&lt;&gt;();<br>        list.add(1);<br>        list.add(2);<br>        list.add(3);<br>        list.add(4);<br>        list.add(5);<br>        list.add(6);<br>        list.add(7);<br>        Stream<Integer> stream &#x3D; list.stream();<br>        long count &#x3D; stream.count();<br>        System.out.println(count);<br>    }<br>}</h2><h2 id="取用前几个：limit对流进行截取，只取用前n个。-x2F-limit是一个延迟方法-用于截取流中的元素-x2F-public-class-Demo06Stream-limit-public-static-void-main-String-args-String-arr-x3D-“西门吹雪”-”叶孤城”-”陆小凤”-”楚留香”-”李寻欢”-””-Stream-stream-x3D-Stream-of-arr-Stream-stream2-x3D-stream-limit-3-x2F-x2F-前三个-stream2-forEach-name-gt-System-out-println-name"><a href="#取用前几个：limit对流进行截取，只取用前n个。-x2F-limit是一个延迟方法-用于截取流中的元素-x2F-public-class-Demo06Stream-limit-public-static-void-main-String-args-String-arr-x3D-“西门吹雪”-”叶孤城”-”陆小凤”-”楚留香”-”李寻欢”-””-Stream-stream-x3D-Stream-of-arr-Stream-stream2-x3D-stream-limit-3-x2F-x2F-前三个-stream2-forEach-name-gt-System-out-println-name" class="headerlink" title="取用前几个：limit对流进行截取，只取用前n个。&#x2F;*    limit是一个延迟方法,用于截取流中的元素 *&#x2F;public class Demo06Stream_limit {    public static void main(String[] args) {        String[] arr &#x3D; {“西门吹雪”,”叶孤城”,”陆小凤”,”楚留香”,”李寻欢”,””};        Stream stream &#x3D; Stream.of(arr);        Stream stream2 &#x3D; stream.limit(3);&#x2F;&#x2F;前三个        stream2.forEach(name-&gt; System.out.println(name));    }}"></a>取用前几个：limit<br>对流进行截取，只取用前n个。<br>&#x2F;*<br>    limit是一个延迟方法,用于截取流中的元素<br> *&#x2F;<br>public class Demo06Stream_limit {<br>    public static void main(String[] args) {<br>        String[] arr &#x3D; {“西门吹雪”,”叶孤城”,”陆小凤”,”楚留香”,”李寻欢”,””};<br>        Stream<String> stream &#x3D; Stream.of(arr);<br>        Stream<String> stream2 &#x3D; stream.limit(3);&#x2F;&#x2F;前三个<br>        stream2.forEach(name-&gt; System.out.println(name));<br>    }<br>}</h2><h2 id="跳过前几个：skippublic-class-Demo07Stream-skip-public-static-void-main-String-args-String-arr-x3D-“西门吹雪”-”叶孤城”-”陆小凤”-”楚留香”-”李寻欢”-Stream-stream-x3D-Stream-of-arr-x2F-x2F-使用skip方法跳过前3个元素-Stream-stream2-x3D-stream-skip-3-x2F-x2F-跳过前三-stream2-forEach-name-gt-System-out-println-name-x2F-x2F-楚留香-李寻欢"><a href="#跳过前几个：skippublic-class-Demo07Stream-skip-public-static-void-main-String-args-String-arr-x3D-“西门吹雪”-”叶孤城”-”陆小凤”-”楚留香”-”李寻欢”-Stream-stream-x3D-Stream-of-arr-x2F-x2F-使用skip方法跳过前3个元素-Stream-stream2-x3D-stream-skip-3-x2F-x2F-跳过前三-stream2-forEach-name-gt-System-out-println-name-x2F-x2F-楚留香-李寻欢" class="headerlink" title="跳过前几个：skippublic class Demo07Stream_skip {    public static void main(String[] args) {        String[] arr &#x3D; {“西门吹雪”,”叶孤城”,”陆小凤”,”楚留香”,”李寻欢”};        Stream stream &#x3D; Stream.of(arr);        &#x2F;&#x2F;使用skip方法跳过前3个元素        Stream stream2 &#x3D; stream.skip(3);&#x2F;&#x2F;跳过前三        stream2.forEach(name-&gt; System.out.println(name));&#x2F;&#x2F;楚留香,李寻欢    }}"></a>跳过前几个：skip<br>public class Demo07Stream_skip {<br>    public static void main(String[] args) {<br>        String[] arr &#x3D; {“西门吹雪”,”叶孤城”,”陆小凤”,”楚留香”,”李寻欢”};<br>        Stream<String> stream &#x3D; Stream.of(arr);<br>        &#x2F;&#x2F;使用skip方法跳过前3个元素<br>        Stream<String> stream2 &#x3D; stream.skip(3);&#x2F;&#x2F;跳过前三<br>        stream2.forEach(name-&gt; System.out.println(name));&#x2F;&#x2F;楚留香,李寻欢<br>    }<br>}</h2><p>组合：concat<br>public class Demo08Stream_concat {<br>    public static void main(String[] args) {<br>        Stream<String> stream1 &#x3D; Stream.of(“西门吹雪”, “叶孤城”, “陆小凤”, “楚留香”, “李寻欢”);<br>        Stream<String> stream2 &#x3D; Stream.of(“杨过”, “小龙女”, “郭靖”, “黄蓉”, “周伯通”);<br>        &#x2F;&#x2F;合并<br>        Stream<String> concat &#x3D; Stream.concat(stream1, stream2);<br>        concat.forEach(name-&gt; System.out.println(name));<br>    }<br>}</p>
<hr>
<p>练习：集合元素处理<br>传统方法：<br>&#x2F;*<br>    现有两个ArrayList集合存储队伍当中的多个成员姓名，要求使用传统for循环<br>    1. 第一个队伍只要名字为3个字的成员姓名，存储到一个新集合中<br>    2. 第一个队伍筛选之后，只要前3个人，存储到一个新集合<br>    3. 第二个队伍只要姓张的成员姓名，存储到一个新集合<br>    4. 第二个队伍筛选之后不要前2个人，存储到一个新集合中<br>    5. 将两个队伍合并为一个队伍，存储到一个新集合中<br>    6. 根据姓名创建Person对象，存储到一个新集合中<br>    7. 打印整个队伍的Person对象信息</p>
<p> *&#x2F;<br>public class Demo01StreamTest {<br>    public static void main(String[] args) {<br>        &#x2F;&#x2F;第一支队伍<br>        ArrayList<String> one &#x3D; new ArrayList&lt;&gt;();<br>        one.add(“西门吹雪”);<br>        one.add(“陆小凤”);<br>        one.add(“叶孤城”);<br>        one.add(“李寻欢”);<br>        one.add(“楚留香”);<br>        ArrayList<String> one1 &#x3D; new ArrayList&lt;&gt;();<br>        for (String name : one) {<br>            if(name.length()&#x3D;&#x3D;3){<br>                one1.add(name);<br>            }<br>        }</p>
<pre><code>    ArrayList&lt;String&gt; one2 = new ArrayList&lt;&gt;();
    for (int i = 0; i &lt; 3; i++) &#123;
        one2.add(one1.get(i));
    &#125;


    //第二支队伍
    ArrayList&lt;String&gt; two = new ArrayList&lt;&gt;();
    two.add(&quot;杨过&quot;);
    two.add(&quot;郭襄&quot;);
    two.add(&quot;小龙女&quot;);
    two.add(&quot;郭靖&quot;);
    two.add(&quot;郭嘉&quot;);
    two.add(&quot;郭奕&quot;);
    two.add(&quot;黄蓉&quot;);

    ArrayList&lt;String&gt; two1 = new ArrayList&lt;&gt;();
    for (String name : two) &#123;
        if(name.startsWith(&quot;郭&quot;))&#123;
            two1.add(name);
        &#125;
    &#125;
    ArrayList&lt;String&gt; two2 = new ArrayList&lt;&gt;();
    for (int i = 0; i &lt; 2; i++) &#123;
        two2.add(two1.get(i));
    &#125;

    ArrayList&lt;String&gt; all = new ArrayList&lt;&gt;();
    all.addAll(one2);
    all.addAll(two2);

    ArrayList&lt;Person&gt; list = new ArrayList&lt;&gt;();
    for (String name : all) &#123;
        list.add(new Person(name,18));
    &#125;
    for (Person person : list) &#123;
        System.out.println(person);
    &#125;
&#125;
</code></pre>
<h2 id="-2"><a href="#-2" class="headerlink" title="}"></a>}</h2><p>Stream流<br>public class Demo02StreamTest {<br>    public static void main(String[] args) {<br>        &#x2F;&#x2F;第一支队伍<br>        ArrayList<String> one &#x3D; new ArrayList&lt;&gt;();<br>        one.add(“西门吹雪”);<br>        one.add(“陆小凤”);<br>        one.add(“叶孤城”);<br>        one.add(“李寻欢”);<br>        one.add(“楚留香”);</p>
<pre><code>    Stream&lt;String&gt; oneStream = one.stream().filter(name-&gt;name.length()==3).limit(3);

    //第二支队伍
    ArrayList&lt;String&gt; two = new ArrayList&lt;&gt;();
    two.add(&quot;杨过&quot;);
    two.add(&quot;郭襄&quot;);
    two.add(&quot;小龙女&quot;);
    two.add(&quot;郭靖&quot;);
    two.add(&quot;郭嘉&quot;);
    two.add(&quot;郭奕&quot;);
    two.add(&quot;黄蓉&quot;);

    Stream&lt;String&gt; twoStream = two.stream().filter(name-&gt;name.startsWith(&quot;郭&quot;)).limit(2);
    Stream.concat(oneStream,twoStream)
        .map(name-&gt;new Person(name,18))
        .forEach(person-&gt; System.out.println(person));
&#125;
</code></pre>
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                            网络编程1.1 软件结构C&#x2F;S结构：全称Client&#x2F;Server结构，客户端和服务器结构。QQ迅雷等B&#x2F;S结构：全称Browser&#x2F;Server结构，浏览器和服务器结构。谷歌火狐1.2 网络通信协议
                        
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